iPhone iOS Firmware iPhone ipsw firmware download that provided by Apple, when you do the relevant operation at your own risk.

IPHONE XS MAX 12.1.3 16D40

IPHONE11,4,IPHONE11,6_12.1.3_16D40_RESTORE.IPSW
Categories:
12.1.3
Version:
3.6GB
Size:
01/22/2019
Date:
Unsigned
Status:
The file can help you a lot ?